I know drops are rng and all but i did ifrit about 30 times in the last few days and also asked people in my grps about this, there wasnt a single blackmage weapon, no one even has seen one.
Meanwhile 8 of our last 10 runs we got a arcanist book (mixed between sch and smn).
I would kindly request a look at the rates if they are really correct because i slowly lose my faith in ever seeing that one drop.